MBP freezes when it goes to sleep - started with latest OS Update (I think)

Beginning on Friday (I believe it was right after I installed the latest OS Update) my MBP has been locking up when I close the lid. I can tell it's locked up because the screen is still light.
When I open the lid again, the clock is stopped, there is no mouse, and everything is frozen solid. My only solution is to hold down the power button for a reset. I have done this five times since Friday.
What might be happening? And, more importantly, what should I do to try to fix the problem?
Thanks.

http://discussions.apple.com/thread.jspa?messageID=9467312&#9467312

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